package com.xy_pro.xymanager.helper;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class SignUtil {
    // 验证签名
    public static boolean checkSignature(String token, String signature, String timestamp, String nonce) {
        String[] arr = new String[]{token, timestamp, nonce};
        // 排序
        Arrays.sort(arr);

        // 拼接字符串
        StringBuilder content = new StringBuilder();
        for (String s : arr) {
            content.append(s);
        }

        // SHA1加密
        String ciphertext = null;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            byte[] digest = md.digest(content.toString().getBytes());
            ciphertext = byteToStr(digest);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        // 比较签名
        return ciphertext != null && ciphertext.equals(signature.toUpperCase());
    }

    // 将字节数组转换为十六进制字符串
    private static String byteToStr(byte[] byteArray) {
        StringBuilder strDigest = new StringBuilder();
        for (byte b : byteArray) {
            strDigest.append(byteToHexStr(b));
        }
        return strDigest.toString();
    }

    // 将字节转换为十六进制字符串
    private static String byteToHexStr(byte mByte) {
        char[] Digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        char[] tempArr = new char[2];
        tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
        tempArr[1] = Digit[mByte & 0X0F];
        return new String(tempArr);
    }
}